I have it and it's excellent. It's bulky, bulkier than you think. I use it with a pass through USB cache battery (only a small one)
Have you connected lights? It shows a frame connection, presumably for earth/return?
Yes lights are connected and the frame is earth. I connected mine back to the front light holder. It's inelegant but works.
@Alan_tbt started
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I have it and it's excellent. It's bulky, bulkier than you think. I use it with a pass through USB cache battery (only a small one)